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SoundExpression
Appendix J: Modem Command Reference
Basic AT Commands (default values are highlighted)
Command Description
AT Attention characters
ATA Answer command
A/ Re-Execute last command
Select ITU-T or Bell
ATB0 Selects ITU-T V.22 when the modem is at 1200bps.
ATB1 Selects Bell 212A when the modem is at 1200bps and Bell 103
when the modem is at 300bps (default).
Transmit Carrier Signal
ATC0 Transmit carrier signal off (returns an error message)
ATC1 Transmit carrier signal on. (default)
Dial Modifiers
Dial Option Description
ATD none Dial. (ATD followed by phone number)
ATDL none Re-dial.
ATDP none Pulse (rotary) dial. 10 pulses per second.
ATDR none Reverse Originate Mode. Places modem in answer mode.
ATDT none Touch tone dial (DTMF).
ATDW 1-255sec Wait for dial-tone. Default is 50 seconds.
ATD, 0-255sec Pause. Default is specified by S-register S8.
ATD@ none Wait for quiet answer.
ATD! none Initiate hook flash.
ATD; none Return to command state after dialing.
ATD^ none Disable calling tone.
ATDS=0-3 none Dial stored number.
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